GitHub user dongjoon-hyun opened a pull request:
https://github.com/apache/spark/pull/18530
[SPARK-20256][SQL][BRANCH-2.1] SessionState should be created more lazily
## What changes were proposed in this pull request?
`SessionState` is designed to be created lazily. However, in reality, it
created immediately in `SparkSession.Builder.getOrCreate`
([here](https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/SparkSession.scala#L943)).
This PR aims to recover the lazy behavior by keeping the options into
`initialSessionOptions`. The benefit is like the following. Users can start
`spark-shell` and use RDD operations without any problems.
**BEFORE**
```scala
$ bin/spark-shell
java.lang.IllegalArgumentException: Error while instantiating
'org.apache.spark.sql.hive.HiveSessionStateBuilder'
...
Caused by: org.apache.spark.sql.AnalysisException:
org.apache.hadoop.hive.ql.metadata.HiveException:
MetaException(message:java.security.AccessControlException:
Permission denied: user=spark, access=READ,
inode="/apps/hive/warehouse":hive:hdfs:drwx------
```
As reported in SPARK-20256, this happens when the warehouse directory is
not allowed for this user.
**AFTER**
```scala
$ bin/spark-shell
...
Welcome to
____ __
/ __/__ ___ _____/ /__
_\ \/ _ \/ _ `/ __/ '_/
/___/ .__/\_,_/_/ /_/\_\ version 2.1.2-SNAPSHOT
/_/
Using Scala version 2.11.8 (Java HotSpot(TM) 64-Bit Server VM, Java
1.8.0_131)
Type in expressions to have them evaluated.
Type :help for more information.
scala> sc.range(0, 10, 1).count()
res0: Long = 10
```
## How was this patch tested?
Manual.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/dongjoon-hyun/spark SPARK-20256-BRANCH-2.1
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/18530.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #18530
----
commit 4843350ecfd358e6cb8c649bd0dad3970e470955
Author: Dongjoon Hyun <[email protected]>
Date: 2017-07-04T17:30:08Z
[SPARK-20256][SQL] SessionState should be created more lazily
----
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